285 lines
11 KiB
JavaScript
285 lines
11 KiB
JavaScript
// @ts-check
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const Ty = require("../../types")
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const DiscordTypes = require("discord-api-types/v10")
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const chunk = require("chunk-text")
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const TurndownService = require("turndown")
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const passthrough = require("../../passthrough")
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const { sync, db, discord } = passthrough
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/** @type {import("../../matrix/file")} */
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const file = sync.require("../../matrix/file")
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/** @type {import("../converters/utils")} */
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const utils = sync.require("../converters/utils")
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const BLOCK_ELEMENTS = [
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"ADDRESS", "ARTICLE", "ASIDE", "AUDIO", "BLOCKQUOTE", "BODY", "CANVAS",
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"CENTER", "DD", "DETAILS", "DIR", "DIV", "DL", "DT", "FIELDSET", "FIGCAPTION", "FIGURE",
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"FOOTER", "FORM", "FRAMESET", "H1", "H2", "H3", "H4", "H5", "H6", "HEADER",
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"HGROUP", "HR", "HTML", "ISINDEX", "LI", "MAIN", "MENU", "NAV", "NOFRAMES",
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"NOSCRIPT", "OL", "OUTPUT", "P", "PRE", "SECTION", "SUMMARY", "TABLE", "TBODY", "TD",
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"TFOOT", "TH", "THEAD", "TR", "UL"
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]
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function cleanAttribute (attribute) {
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return attribute ? attribute.replace(/(\n+\s*)+/g, "\n") : ""
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}
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const turndownService = new TurndownService({
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hr: "----",
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headingStyle: "atx",
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preformattedCode: true,
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codeBlockStyle: "fenced"
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})
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turndownService.remove("mx-reply")
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turndownService.addRule("strikethrough", {
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filter: ["del", "s", "strike"],
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replacement: function (content) {
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return "~~" + content + "~~"
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}
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})
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turndownService.addRule("underline", {
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filter: ["u"],
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replacement: function (content) {
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return "__" + content + "__"
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}
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})
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turndownService.addRule("blockquote", {
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filter: "blockquote",
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replacement: function (content) {
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content = content.replace(/^\n+|\n+$/g, "")
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content = content.replace(/^/gm, "> ")
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return content
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}
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})
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turndownService.addRule("inlineLink", {
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filter: function (node, options) {
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return (
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options.linkStyle === "inlined" &&
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node.nodeName === "A" &&
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node.getAttribute("href")
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)
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},
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replacement: function (content, node) {
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if (node.getAttribute("data-user-id")) return `<@${node.getAttribute("data-user-id")}>`
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if (node.getAttribute("data-channel-id")) return `<#${node.getAttribute("data-channel-id")}>`
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const href = node.getAttribute("href")
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let title = cleanAttribute(node.getAttribute("title"))
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if (title) title = ` "` + title + `"`
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let brackets = ["", ""]
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if (href.startsWith("https://matrix.to")) brackets = ["<", ">"]
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return "[" + content + "](" + brackets[0] + href + title + brackets[1] + ")"
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}
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})
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turndownService.addRule("fencedCodeBlock", {
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filter: function (node, options) {
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return (
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options.codeBlockStyle === "fenced" &&
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node.nodeName === "PRE" &&
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node.firstChild &&
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node.firstChild.nodeName === "CODE"
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)
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},
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replacement: function (content, node, options) {
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const className = node.firstChild.getAttribute("class") || ""
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const language = (className.match(/language-(\S+)/) || [null, ""])[1]
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const code = node.firstChild
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const visibleCode = code.childNodes.map(c => c.nodeName === "BR" ? "\n" : c.textContent).join("").replace(/\n*$/g, "")
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var fence = "```"
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return (
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fence + language + "\n" +
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visibleCode +
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"\n" + fence
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)
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}
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})
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/**
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* @param {string} roomID
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* @param {string} mxid
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* @returns {Promise<{displayname?: string?, avatar_url?: string?}>}
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*/
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async function getMemberFromCacheOrHomeserver(roomID, mxid, api) {
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const row = db.prepare("SELECT displayname, avatar_url FROM member_cache WHERE room_id = ? AND mxid = ?").get(roomID, mxid)
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if (row) return row
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return api.getStateEvent(roomID, "m.room.member", mxid).then(event => {
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db.prepare("REPLACE INTO member_cache (room_id, mxid, displayname, avatar_url) VALUES (?, ?, ?, ?)").run(roomID, mxid, event?.displayname || null, event?.avatar_url || null)
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return event
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}).catch(() => {
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return {displayname: null, avatar_url: null}
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})
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}
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/**
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* @param {Ty.Event.Outer<Ty.Event.M_Room_Message>} event
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* @param {import("discord-api-types/v10").APIGuild} guild
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* @param {{api: import("../../matrix/api")}} di simple-as-nails dependency injection for the matrix API
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*/
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async function eventToMessage(event, guild, di) {
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/** @type {(DiscordTypes.RESTPostAPIWebhookWithTokenJSONBody & {files?: {name: string, file: Buffer}[]})[]} */
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let messages = []
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let displayName = event.sender
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let avatarURL = undefined
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/** @type {string[]} */
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let messageIDsToEdit = []
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let replyLine = ""
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// Extract a basic display name from the sender
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const match = event.sender.match(/^@(.*?):/)
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if (match) displayName = match[1]
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// Try to extract an accurate display name and avatar URL from the member event
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const member = await getMemberFromCacheOrHomeserver(event.room_id, event.sender, di?.api)
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if (member.displayname) displayName = member.displayname
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if (member.avatar_url) avatarURL = utils.getPublicUrlForMxc(member.avatar_url)
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// Convert content depending on what the message is
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let content = event.content.body // ultimate fallback
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if (event.content.format === "org.matrix.custom.html" && event.content.formatted_body) {
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let input = event.content.formatted_body
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if (event.content.msgtype === "m.emote") {
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input = `* ${displayName} ${input}`
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}
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// Note: Element's renderers on Web and Android currently collapse whitespace, like the browser does. Turndown also collapses whitespace which is good for me.
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// If later I'm using a client that doesn't collapse whitespace and I want turndown to follow suit, uncomment the following line of code, and it Just Works:
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// input = input.replace(/ /g, " ")
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// There is also a corresponding test to uncomment, named "event2message: whitespace is retained"
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// Handling edits. If the edit was an edit of a reply, edits do not include the reply reference, so we need to fetch up to 2 more events.
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// this event ---is an edit of--> original event ---is a reply to--> past event
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await (async () => {
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if (!event.content["m.new_content"]) return
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const relatesTo = event.content["m.relates_to"]
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if (!relatesTo) return
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// Check if we have a pointer to what was edited
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const relType = relatesTo.rel_type
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if (relType !== "m.replace") return
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const originalEventId = relatesTo.event_id
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if (!originalEventId) return
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console.log("a", originalEventId)
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messageIDsToEdit = db.prepare("SELECT message_id FROM event_message WHERE event_id = ? ORDER BY part").pluck().all(originalEventId)
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if (!messageIDsToEdit.length) return
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// Get the original event, then check if it was a reply
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const originalEvent = await di.api.getEvent(event.room_id, originalEventId)
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if (!originalEvent) return
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const repliedToEventId = originalEvent.content["m.relates_to"]?.["m.in_reply_to"]?.event_id
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if (!repliedToEventId) return
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console.log("c")
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// After all that, it's an edit of a reply.
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// We'll be sneaky and prepare the message data so that everything else can handle it just like original messages.
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Object.assign(event.content, event.content["m.new_content"])
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input = event.content.formatted_body || event.content.body
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relatesTo["m.in_reply_to"] = {event_id: repliedToEventId}
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})()
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// Handling replies. We'll look up the data of the replied-to event from the Matrix homeserver.
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// Note that an <mx-reply> element is not guaranteed because this might be m.new_content.
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await (async () => {
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const repliedToEventId = event.content["m.relates_to"]?.["m.in_reply_to"]?.event_id
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if (!repliedToEventId) return
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const repliedToEvent = await di.api.getEvent(event.room_id, repliedToEventId)
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if (!repliedToEvent) return
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const row = db.prepare("SELECT channel_id, message_id FROM event_message WHERE event_id = ? ORDER BY part").get(repliedToEventId)
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if (row) {
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replyLine = `<:L1:1144820033948762203><:L2:1144820084079087647>https://discord.com/channels/${guild.id}/${row.channel_id}/${row.message_id} `
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} else {
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replyLine = `<:L1:1144820033948762203><:L2:1144820084079087647>`
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}
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const sender = repliedToEvent.sender
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const senderName = sender.match(/@([^:]*)/)?.[1] || sender
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const authorID = db.prepare("SELECT discord_id FROM sim WHERE mxid = ?").pluck().get(repliedToEvent.sender)
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if (authorID) {
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replyLine += `<@${authorID}>: `
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} else {
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replyLine += `Ⓜ️**${senderName}**: `
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}
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const repliedToContent = repliedToEvent.content.formatted_body || repliedToEvent.content.body
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const contentPreviewChunks = chunk(repliedToContent.replace(/.*<\/mx-reply>/, "").replace(/(?:\n|<br>)+/g, " ").replace(/<[^>]+>/g, ""), 50)
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const contentPreview = contentPreviewChunks.length > 1 ? contentPreviewChunks[0] + "..." : contentPreviewChunks[0]
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replyLine = `> ${replyLine}\n> ${contentPreview}\n`
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})()
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// Handling mentions of Discord users
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input = input.replace(/("https:\/\/matrix.to\/#\/(@[^"]+)")>/g, (whole, attributeValue, mxid) => {
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if (!utils.eventSenderIsFromDiscord(mxid)) return whole
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const userID = db.prepare("SELECT discord_id FROM sim WHERE mxid = ?").pluck().get(mxid)
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if (!userID) return whole
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return `${attributeValue} data-user-id="${userID}">`
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})
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// Handling mentions of Discord rooms
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input = input.replace(/("https:\/\/matrix.to\/#\/(![^"]+)")>/g, (whole, attributeValue, roomID) => {
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const channelID = db.prepare("SELECT channel_id FROM channel_room WHERE room_id = ?").pluck().get(roomID)
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if (!channelID) return whole
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return `${attributeValue} data-channel-id="${channelID}">`
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})
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// Element adds a bunch of <br> before </blockquote> but doesn't render them. I can't figure out how this even works in the browser, so let's just delete those.
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input = input.replace(/(?:\n|<br ?\/?>\s*)*<\/blockquote>/g, "</blockquote>")
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// The matrix spec hasn't decided whether \n counts as a newline or not, but I'm going to count it, because if it's in the data it's there for a reason.
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// But I should not count it if it's between block elements.
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input = input.replace(/(<\/?([^ >]+)[^>]*>)?\n(<\/?([^ >]+)[^>]*>)?/g, (whole, beforeContext, beforeTag, afterContext, afterTag) => {
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// console.error(beforeContext, beforeTag, afterContext, afterTag)
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if (typeof beforeTag !== "string" && typeof afterTag !== "string") {
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return "<br>"
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}
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beforeContext = beforeContext || ""
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beforeTag = beforeTag || ""
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afterContext = afterContext || ""
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afterTag = afterTag || ""
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if (!BLOCK_ELEMENTS.includes(beforeTag.toUpperCase()) && !BLOCK_ELEMENTS.includes(afterTag.toUpperCase())) {
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return beforeContext + "<br>" + afterContext
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} else {
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return whole
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}
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})
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// @ts-ignore bad type from turndown
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content = turndownService.turndown(input)
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// It's optimised for commonmark, we need to replace the space-space-newline with just newline
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content = content.replace(/ \n/g, "\n")
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} else {
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// Looks like we're using the plaintext body!
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// Markdown needs to be escaped
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content = content.replace(/([*_~`#])/g, `\\$1`)
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}
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content = replyLine + content
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// Split into 2000 character chunks
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const chunks = chunk(content, 2000)
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messages = messages.concat(chunks.map(content => ({
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content,
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username: displayName,
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avatar_url: avatarURL
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})))
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const messagesToEdit = []
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const messagesToSend = []
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for (let i = 0; i < messages.length; i++) {
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if (messageIDsToEdit.length) {
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messagesToEdit.push({id: messageIDsToEdit.shift(), message: messages[i]})
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} else {
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messagesToSend.push(messages[i])
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}
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}
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return {
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messagesToEdit,
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messagesToSend,
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messagesToDelete: messageIDsToEdit
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}
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}
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module.exports.eventToMessage = eventToMessage
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